Instructions
Insert the "Scribblenauts" game cartidge and power on the Nintendo DS.
Tap the notepad icon on the upper-right side of the title screen.
Type "UNICORN" and select "OK."
Open the notepad again. Type "Cupid's Bow" and hit "OK."
Drag the Cupid's Bow on top of your character to equip it. Find the unicorn, as it will have fled to the left or right side of the level.
Aim and shoot the Cupid's Bow at the unicorn. Tap the unicorn and select "Shoot." The unicorn will immediately become more friendly toward your character.
Be sure to feed and pet your unicorn many times. This will help your unicorn feel more comfortable around you.